Deputies arrested a 39-year-old Yukon man they said conspired to sexually abuse a newborn baby and traded child pornography.

The Midwest City Police Department contacted the Canadian County Sheriff's Office after collecting evidence on Thomas Deffner. The evidence showed Deffner's Facebook activity involving exploitation of children and distribution of child porn linking back to Canadian County.

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Deffner had been involved in a conversation with a pregnant Midwest City woman about how the two planned to rape, torture and sexually molest her unborn child, Sheriff's Office officials said. He told the woman in detail how he was going to sexually assault the child.

The woman agreed to let Deffner fulfill his fantasies with her child and said she would take part in it, officials said.

“This is one of, if not the sickest things I’ve ever heard of," Canadian County Sheriff Chris West said. "I can’t describe the evil and deranged details of what they were planning to do to this innocent and defenseless baby."

The Oklahoma Department of Human Services have placed the pregnant woman's children into protective custody.

Investigators also learned that Deffner coaxed an 11-year-old Oklahoma County girl to send nude pictures of herself and scheduled a meetup for later this year, officials said. Officers found seven images of the girl and other child pornography on Deffner's electronic devices at his home.

“It sickens me to no end that an 11-year-old girl spent any amount of time alone with such a sick and demented individual as Deffner," West said. "I pray that baby wasn’t scarred for life."

Deffner was arrested Friday on a complaint of procuring a minor in child pornography, possession of a controlled dangerous substance and possession of drug paraphernalia. He was booked into the Canadian County Jail.

Deffner has not been charged, officials said. Authorities are searching for more possible victims.

Charges against the pregnant woman are being handled by the Midwest City Police Department.